Functions of No-volt Release
At the point when the motor reaches at the normal speed and the arm is reached at the ON position, the entire starting resistance is cut off from the circuit. Now in running condition, assuming that the supply is interrupted or disconnected, the starting arm remains at the ON position. Additionally, the armature winding is connected directly across the primary supply when the supply is restored, so there is no back EMF in the circuit.
Hence, in this condition, an excessive amount of current starts flowing through the armature winding and it might harm. Thus, to stay away from this situation no-volt release is used in a circuit to pull back the arm to the OFF position.
The no-release coil consists of an electromagnet that is connected in series with the shunt field winding. At the point when the supply is ON, it attracts the soft iron keeper. In any case if supply fails or intruded on, the electromagnet is demagnetized and releases a soft iron keeper. Because of the spiral force of the spring, the arm is pulled back to the OFF position and disconnects the main supply.
Additionally, the shunt field winding open-circuit prevention function of no-volt release is an additional function. Since the no-volt discharge is associated in series with the shunt field winding. Assuming that the shunt field winding is open-circuited, the current flowing through the no-volt release is zero. Additionally, it releases the coil to the OFF position and demagnetizes the coil.
Three Point Starter
The primary errand of a motor starter is to start as well as stop the motor to which it is united. Starters, like relays, are electromechanical switches designed specifically to protect the motor from overload. The starter gives the supply to the motor manually or automatically as well as protects the motor from faults or overload. It based on the types of motors, the motor starters are available in various sizes with different ratings in the market. This article discusses 3 point starter which is used in business as well as industrial applications.
Table of Content
- What is a Three-Point Starter?
- Construction
- Working
- 3-Point Starter Vs 4-Point Starter
- Advantages
- Disadvantages
- Applications